Runner's World Essential Guides: Fast Fuel: Everything You Need to Know about What to Eat for Optimum Energy on the Run

The question What should I eat? troubles all of us on a daily basis, but it's perhaps most vexing for runners, who rely on food to fuel their workouts and feel good. Most runners take in calories and nutrients in the form of energy bars, nutrient-enhanced drinks, and fortified packaged foods. The problem is, "real" foods--fruits, vegetables, whole grains, lean meats--are better for you than fortified products. That's because there's more to a carrot or a sweet potato than just vitamin A. Wi...